The Standard 9mm Hydraulic Buffer model has our normal amount of hydraulic resistance. This is the best choice for short barreled 9mm applications (7.5" barrel or less) but can be used for all PCC barrel lengths. This buffer has the standard amount of hydraulic resistance that we have historically used in our 9mm buffers. This is a great fit for a wide range of PCC guns. Can be used with our PCC buffer weight to add mass and further slow the action. This buffer is not recommended for use with lightened bolts or short stroke systems.